I nicked these from somewhere on the internet.
Useful Property Links
Bank of Thailand: 02-283-5353
http://www.bot.or.th Government Housing Bank: 02-246-0303,
http://www.ghbhomecenter.com The Lands Department: 02-222-6131-40,
http://www.dol.go.th The National Housing Authority: 02-377-2010-22,
http://www.nhanet.or.th The Legal Execution Department: 02-433-6001-5, 433-6007-9, 881-4999,
http://www.led.go.th The Consumer Protection Board: 02-282-4579,
http://www.ocpb.go.th Real Estate Information Centre: 02-202-1760-1,
http://www.reic.or.th The Thai Real Estate Association: 02-229-3188-90,
http://www.thairealestate.org The Housing Business Association: 02-440-1274-6,
http://www.housingbiz.org The Thai Condominium Association: 02-260-3592-9
The Real Estate Broker Association: 02-986-5388-9,
http://www.reba.or.th The Association of Siamese Architects: 02-319-4124, 02-319-6555, 02-719-6292-4,
http://www.asa.or.th The Thai Contractors' Association: 02-255-3991-2,
http://www.tca.or.th The Thai Valuers' Association: 02-260-3880-1,
http://www.tva.or.th Agency for Real Estate Affairs Co: 02-295-2294,
http://www.area.co.th PropertyLines Co: 02-941-0152-71,
http://www.propertylines.co.th Dr X